Posted by BillyinStoughton on December 13, 2011 at 06:21:36 from (64.73.44.244):
In Reply to: H Thermostat posted by George Rausch on December 12, 2011 at 15:43:48:
As David G has said, coolant system pressure is controlled by the radiator cap. My H has a 5# cap on it currently. Now that being said, the higher the coolant temperature the higher the pressure the system will run at due to the expansion that Dave mentioned. The idea behind running a pressurized system is that it increases the boiling point of the coolant and therefore increases system cooling capacity. For every 1# of pressure your system runs you increase the boiling point of the coolant 3 degrees.
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